BIG SUNSPOT ALERT: A big new sunspot is emerging from the farside of the sun. NASA’s Solar Dynamics Observatory can see it rotating over the sun’s northeastern limb. It is too soon to say what kind of magnetic field the foreshortened active region possesses. A mixed-polarity field could lead to Earth-directed flares later this week. Solar flare alerts: SMS Text
OVAL MOON HALO: Moon halos (rings of light around the Moon caused by ice crystals in the air) are supposed to be circular. “Last Friday I looked out the window and saw a Moon halo–but it was not round at all,” says Lauri Kangas of Amethyst Bay, Ontario, Canada:

What he saw (and photographed above) was a circumscribed halo. “It was the most elliptically-shaped circumscribed halo I have ever seen,” says Kangas.
The circumscribed halo is a rarer sight than the more common 22º circular halo. It appears when moonlight is refracted by long pencil-shaped ice crystals in high cirrus clouds. These little frozen “pencils” slowly rain down from the clouds. Aerodynamic friction aligns them parallel to the ground, and when the alignment is almost perfect the circumscribed halo appears. For this reason, it is a rare sight indeed.
